Abstract
Impedance spectroscopy is employed for studying the behavior of the interface of the SmCo0.8Ti0.2O3 semiconducting oxide electrode with a sodium-conducting solid electrolyte (Na+–SE) in atmospheres of argon and oxygen. Compounds with the susceptibility to hydration decreasing in the row Na5TbSi4O12 → Na3Zr2Si2PO12 → Na3Sc2(PO4)3 are used as the Na+–SE. Only the systems containing the Na5TbSi4O12 solid electrolyte, the grain surfaces of which acquire boundary layers formed by hydration products, are sensitive to oxygen. The exchange current of the electrode reaction O2 (g) + e ⇆ O2 – increases from 1.8 to 19 mA/cm2 in the temperature interval 250–300°C. The systems with Na+–SE that are not prone to hydration remain inactive in the oxygen atmosphere probably due to quick blocking of the active centers by nonconducting products of the secondary chemical reaction Na+ + O2 – → NaO2 .
Similar content being viewed by others
REFERENCES
Ohbayashi, H., Kudo, T., and Gejo, N., Jpn. J. Appl. Phys., 1974, vol. 13, p. 1.
Yamamoto, O., Takeda, Y., Kanno, R., and Noda, M., Solid State Ionics, 1987, vol. 22, p. 241.
Takeda, Y., Kanno, R., Noda, M., and Yamamoto, O., J. Electrochem. Soc., 1987, vol. 134, p. 2656.
Meadowcroft, D.B., Nature, 1970, vol. 226, p. 847.
Zhang, H.M., Shimizu, Y., Teraoka, Y., et al., J. Catal., 1990, vol. 121, p. 432.
Tkacheva, N.S., Korosteleva, A.I., and Bukun, N.G., Elektrokhimiya, 1998, vol. 34, p. 427.
Grafov, B.M. and Ukshe, E.A., Elektrokhimiya, 1974, vol. 10, p. 1875.
Ukshe, E.A. and Bukun, N.G., Tverdye elektrolity (The Solid Electrolytes), Moscow: Nauka, 1977.
De Jonghe, L., Buechele, A., and Armand, M., Solid State Ionics, 1983, vol. 9-10, p. 165.
McHale, A.E., Kilner, J.A., and Steel, B.C.H., Transport in Nonstoichiometric Compounds, Simkovich, G., Ed., New York: Plenum, 1985, p. 217.
Bukun, N.G., Ukshe, A.E., and Ukshe, E.A., Elektrokhimiya, 1993, vol. 29, p. 110.
Grafov, B.M. and Ukshe, E.A., Elektrokhimicheskie tsepi peremennogo toka (Electrochemical AC Circuits), Moscow: Nauka, 1973.
Glemser, O. and Harter, E., Z. Anorg. Allg. Chem., 1956, vol. 283, p. 111.
Efremov, V.A. and Kalinin, V.V., Kristallografiya, 1978, vol. 23, p. 703.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Leonova, L.S., Tkacheva, N.S. & Bukun, N.G. Effect of the Nature of a Sodium-Conducting Solid Electrolyte on the Impedance of Its Interface with the SmCo0.8Ti0.2O3 Oxide Electrode in an Oxygen Atmosphere. Russian Journal of Electrochemistry 38, 596–601 (2002). https://doi.org/10.1023/A:1016042232219
Issue Date:
DOI: https://doi.org/10.1023/A:1016042232219